Improvement in piston-valves



dirti/eil Statua muy@ l Letters Patent No. 83,739, (lated November 1868.

IMPROVEMENT IN PISTON-VALVES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom. it lmay concern:

Be it known that I, M. C. Srnmxs, of Springfield, in the county of Hampden, and State of Massac] inserts, have invented anew and useful lmpro ved Piston-Valve and I do hereby declare that the following is a full, clear, and exact descliption thereof, reference being had to the accompanying drawings, making a part of this specification, and to the letters of reference marked thereon, in which- Figure l is a plan view ot' the valve 5 Figure 2 is Va reverse plan view ofthe same;

Figure 3 is a vertical section through lineEF ot'iig l;

Figure 4 is a side elevation ofthe spider;

I Figure 5 is a plan view of the valve-disk,

Figure (5 is a reverse plan view of the same;

Figure 7 is a side elevation ofthe same;

Figure S is a side elevation 'of the follower, having the valve-seat therein; y

Figure 9 is a plan view ofthe packing-ring,

Figure 10 is a side elevation ofthe same Figure l1 isa side elevation ofthe disk-guard plate; and

Figure l2 is a plan view ofthe follower.

My invention consists in the arrangement and construction of i valve. with a guide and spring,i whereby said valve may be kept more properly in its place, and perform its functions more regularly and perfectly than is the case with those now in use.

That others skilled in the art may be able to make and use my invention, I will proceed to describe its construction and mode of operation.

In the drawings, D represents the follower, 4or solid portion of the piston, both sides of which are made plane orV dat, one side, however, having thereon the circular central projection c, and the other, or opposite side, having a circular portion cut away, for the insertion of the valve with its attachments, luto the first circular space, c, made by cutting away such circular portion of the piece D, is placed the bar a', being secured in place by means' of screws, or in any other suitable manner.

The chamber m is also made in the follower D, the circumference of which chamber is bevelled, or is made at an angle of less than ninety degrees to its base, the outer diameter of said chamber being greater than its inner diameter, and a space, t, is lett in the ibllower, that the valve-disk m may have suilicient room to move when' in practical operation.

Perforations, c' i, are made from the chamber m through the part c, and to the outside of the said part e is secured, by means of screws, or in any other proper manner, the spider B, having any desired number of projections or legs, l) I1, having holes therein through which to pass the screws or bolts l i, to secure it in place upon the follower D.

Around the central projection e is au annular space, into which is placed suitable packing, as leather, a hole being Iirst cut therein, through which protrudes the projection e, said packing being also out suiiciently large to be bent down all around the follower D, at c. The packing-ring A, which may be of suiiicient thickness and strength to secure the packing in place, is then placed on the follower D, in the annular space x, and over the leather'packing, and is secured in place by means of the screws h h.

The valve-disk m is a circular piece of metal, made in the form of a truncated cone, its tapered or bevclled periphery iitting closely the periphery of the chambers m', and upon the base of thcdisk fm is the projection (I, which may be cylindrical in form.

This projection al has a chamber, o, therein, into which inserted the small projection or pin n, upon the bar a', a small spiral spring, s, being rst placed upon the projection d, upon the disk m. A threaded hole is made in the circular portion of the spider B, into which is turned the rod C, having a screw-thread cut thereon, by which to move the valve to and fro in the cylinder.

Having thus described its construction, I will now proceed to describe its inode of operation.

The spider B being properly attached to the follower D, the disk 'm is inserted in its chamber, fm', the spiralv spring .splaced over the projection d, upon the disk fm, and the bar a', with the projection n thereon, inserted iu the chamber o, in the said projection (Z,- is then secured to the follower D, outside the disk yn, by screws or otherwise. The packing c being secured around the follower D by means of the ring A, the valve, if it is to be used in an air-condenser, is inserted in the cylinder, fitting snugly therein, a similar valve, but without any rod C, being first inserted in the cylinder, near the bottom, and firmly secured, both valves, if used in an air-condenser, heilig placed in the cylinder with thedisk m downwards.

lf, now, the piston, or valve, as I prefer to denominate the whole as arranged, be down, and it be drawn upward, the lower valve, remaining stationary with reference to its position in thecylinder, a vacuum is formed between the two valves, by drawing up the upper one, and the disk nzv ofthe lower valve is closed, or is forced upward against its bevelled seat in the chamber lin. The air is thus prevented from passing up through the lower valve into the cylinder, and enters the cylinder through apertures in the upper part ofsaid cylinder, made for that purpose, passes down through the apertures i i, in the valve, and, pressing upon the disk m., forces it away from its seat, mf, and enters the cylinder between the valves, through the space around the disk m, between it and its seat. This continues as lon as the valve is drawn upward. When the upper valve is forced downward, th pressure of the air be tween the valves forces the disk m of the upper valve upward against its tapered scat, thus closing that valve, and preventing the exit of the air in that direction. The disk m, of the lower valve, is conscquentlyforced downward, away from its seat, which opens the passage through said lower valve, and the air is then free to pass out. The small protuberancc or projection u, upon the har c', which is inserted into the chamber o, of the projection (l, serves to keep the disk m always in a position to be forced directly to its seat, without tilting, and lthe small spiral spring s assists in keeping the disk ah 7ays against its seat.

I am aware that various devices have been' used, in which a puppet-.valve or disk is shown, and I. do not claim said devices, or any part of them, when considered irrespective of my particular arrangement and construction, the objectand design of my invention being solely to insure a more certain and perfect working of the disk, by means of the chambered guide and spring, as herein described.

Having therefore described my invention, vWhat I do claim as new, and desire to seclne by Letters Patent, is- The combination and arrangement ofthe piston D, having the bevelled seat or chamber m. therein, the disk Vm having the chambered projection d thereon, with its spring, s, and the bar af', with the projection 11- thereon, operating within said chambered proj ection (I, the whole constituting an improved piston-valve, and constructed and operating substantially as herein described and set forth.

M. G. STEBBINS. Witnesses:

T. A. CURTIS, F. E. RICE. 

